Mr William Stevenson on the Origin of Granite. 165 
IV. On the Homology of the Vertebrate Cranium. By Professor 
Macdonald, St Andrews. 
Wednesday, 2^th April 1864. — William Turner, Esq., M.B., 
President, in the Chair. 
David Young, Esq., Medical Missionary Dispensary, Cowgate, was 
balloted for, and elected a non-resident member of the Society. 
The Report of the Treasurer, Mr G. Logan, W.S., was read and 
approved. 
The usual Committees were appointed, for prosecuting special in- 
vestigations during the summer recess. 
The following Donations were laid on the table, and thanks voted to 
the Donors : — 
1. Proceedings of the Academy of Natural Sciences of Philadelphia, 
1863. — From the Academy. 2. Proceedings of the Literary and Phi- 
losophical Society of Liverpool, No. 47, 1862-63. — From the Society. 
3. Proceedings of the Royal Society, Nos. 57-61. — From the Society. 
4. Canadian Journal of Industry, Science, and Art. New Series. Nos. 
48, 49. Nov. 1863, Jan. 1864.— From the Canadian Institute. 5. 
Jahrbuch der Kaiserlich — Koniglichen Geologishen Reichsanstalt, 1863. 
XIII. Band, Nro. 3, Juli, August, September. — From the I. R. Geolo- 
gical Institute of Austria. 6. Dublin Medical Press. Second Series. 
Vol. VIII. No. 199. — From the Publisher. 7. Journal of the Proceed- 
ings of the Linnean Society. A complete series from March 1856 to 
October 1863. — From the Society. 
The following Communications were read : — 
I. On the Origin of Granite, By Wm. Stevenson, Esq., Dunse, Com- 
municated by George Logan, Esq., W.S. 
The object of this paper is not to discuss the various 
opinions which have been held relative to the origin of 
granite, — opinions with which the Members of this Society 
must all be familiar, but simply to lay down a proposition 
embodying the author's views on the subject, — following this 
up by references to the phenomena exhibited in certain loca- 
lities, so that all who feel interested may go to nature, 
examine and judge for themselves. 
Proposition. — Granite is the result of the fusion {total or 
partial)^ hy means of molten felspar, of rocks adjacent 
to the place of eruption. 
It may be of any geological age, but is in general found 
